有没有办法在pyspark中收集嵌套模式中所有字段的名称

from pyspark.sql import SparkSession
from pyspark.sql.functions import explode

# 创建SparkSession
spark = SparkSession.builder.getOrCreate()

# 创建示例数据
data = [
    ("Alice", [("Math", 90), ("English", 85)]),
    ("Bob", [("Math", 95), ("Science", 88), ("English", 92)])
]
df = spark.createDataFrame(data, ["Name", "Subjects"])

# 使用explode函数展开嵌套字段
df_expanded = df.select("Name", explode("Subjects").alias("Subject"))

# 获取展开后的所有字段名称
field_names = df_expanded.columns

# 打印结果
print(field_names)

['Name', 'Subject']